Pollutant Concentrations

Air quality readings will be available hourly from 7am to 11pm. Air quality readings from 12am to 6am will be made available at 7am on the same day.

Readings on 08 Jan 2015

View reading for:

Region

24-hr Sulphur dioxide(µg/m3)

24-hr PM10(µg/m3)

1-hr Nitrogen dioxide(µg/m3)a

8-hr Ozone(µg/m3)

8-hr Carbon monoxide(mg/m3)

24-hr PM2.5(µg/m3)

North

10(6)

16(16)

17(-)

5(2)

0.4(4)

8(34)

South

11(7)

16(16)

36(-)

9(4)

0.4(4)

9(36)

East

9(5)

16(16)

14(-)

15(7)

0.2(2)

10(41)

West

3(2)

13(13)

52(-)

22(9)

0.5(5)

7(29)

Central

6(4)

12(12)

34(-)

22(9)

0.3(3)

7(27)

1-hr PM2.5 (µg/m3)b Readings on 08 Jan 2015

View reading for:

Time

1am

2am

3am

4am

5am

6am

7am

8am

9am

10am

11am

12pm

North

14

3

5

3

4

3

7

5

6

6

8

11

South

3

3

2

3

2

2

5

4

5

10

8

17

East

12

7

15

9

14

18

13

5

6

4

10

11

West

9

4

2

6

3

6

4

6

4

9

4

12

Central

5

2

4

3

2

5

4

3

7

5

6

8

Time

1pm

2pm

3pm

4pm

5pm

6pm

7pm

8pm

9pm

10pm

11pm

12am

North

25

9

8

4

7

9

6

6

9

9

9

-

South

15

15

21

14

18

7

12

11

10

8

8

-

East

15

9

3

6

12

10

7

8

9

8

10

-

West

9

6

8

8

7

4

10

12

9

9

7

-

Central

5

17

9

15

6

4

6

11

8

7

7

-

Note:a Sub-index for nitrogen dioxide is reported only when the 1-hr concentration equals or exceeds 1130 µg/m3.

b There is no sub-index for 1-hr PM2.5.

3-hr PSI Readings from 1am to 12am on
08 Jan 2015

Time

1am

2am

3am

4am

5am

6am

7am

8am

9am

10am

11am

12pm

3-hr PSI

42

33

25

20

22

23

26

25

24

24

27

35

Time

1pm

2pm

3pm

4pm

5pm

6pm

7pm

8pm

9pm

10pm

11pm

12am

3-hr PSI

45

51

48

42

41

36

34

34

37

37

35

-

Hourly updates of 3-hr PSI readings are provided from 7am to 11pm. The 3-hr PSI readings from 12am to 6am will be made available at 7am on the same day. The 3-hr PSI readings are calculated based on PM2.5 concentrations only.